One of the worst Animes I have ever seen.
The premise is that young girls wearing flying boots modelled off of WWII era aircraft are the only things on this alternate version of Earth that can consistently defeat the attacks of an unknown invading force hell bent on razing the planet for unknown reasons.
Lets get the 'good stuff' out the way. The art isn't all that bad, generic character designs and such, but the boots modelled off of WWII aircraft do look good. Also the designs of the Neuroi enemies based on prototype aircraft were also pretty good.
The sound wasn't terrible. The OP and ED weren't very memorable and the actual sound design didn't really have any faults.
The story is full of plot devices designed for fanservice. Only gender with magical powers are women, and they 'reach their magical peak' at 18 years old. The lack of trousers and skirts is put down to the girls needing to be ready at a moments notice to sortie, although in this version of Japan, it seems young girls generally just only wear underwear.
The actual plot is full of rehashed ideas and tired cliches borrowed from a variety of other anime. Unassuming young teenage protagonist is thrust into a world of magic and/or battles against mysterious and powerful enemy, and suprisingly has great untapped potential. Each episode revolves around some plot point for minor character development which is resolved in the end by usually overcoming a challenge to destroy a bad guy. The required forseeable plot twist near the end is also present.
Character development is incredibly minimal for characters outside of the protagonist Yoshika, which leaves the show with a cast of one dimensional stereotypes with different body design to appeal to varying fetishes.
All in all, its a terrible show, and only for those who need more loli fapping material.